Re: Should green_saver.ko shut off a laptop's backlight?

From: Doug Barton <dougb_at_FreeBSD.org>
Date: Mon, 29 Nov 2010 13:37:19 -0800
On 11/29/2010 13:14, John Baldwin wrote:
> On Monday, November 29, 2010 4:10:02 pm Doug Barton wrote:
>> On 11/29/2010 07:09, John Baldwin wrote:
>>> On Saturday, November 27, 2010 11:30:56 pm Adam Vande More wrote:
>>>> On Sat, Nov 27, 2010 at 6:39 PM, Doug Barton<dougb_at_freebsd.org>   wrote:
>>>>
>>>>> My recollection is that green_saver should turn off an LCD backlight, but I
>>>>> just loaded it up on my laptop and it's not doing so. It does remove the
>>>>> text from the screen, but the backlight is still on (i.e., it is doing
>>>>> exactly what blank_saver does).
>>>>>
>>>>> When running X DPMS works on that same laptop, so I know the hardware is
>>>>> capable. This is 9-current amd64 at r214025. Any suggestions are welcome.
>>>>>
>>>>
>>>> It's never worked for me either and this has been around awhile.
>>>>
>>>> http://www.freebsd.org/cgi/query-pr.cgi?pr=114928&cat=
>>>
>>> green_saver just ask's your video card's BIOS to shut the screen off.  If the
>>> BIOS doesn't turn off the backlight, that is the BIOS's problem, not
>>> something we can fix.
>>
>> Ok, so does the attached seem reasonable?
>
> I would say 'If the monitor and the video card's BIOS support it' because
> both things have to be true for green_saver to work.  and/or implies that
> only one has to be true.  I'm not sure the second paragraph is truly needed
> since I've seen it work fine with LCD's on other laptops and other external
> monitors as well.  I think simply adding the text about the video card's
> BIOS is sufficient (and a definite improvement).

Ok, done in r216065, thanks. I will update the PR soon'ish.


Doug

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Received on Mon Nov 29 2010 - 20:37:22 UTC

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